AWS SDK for .NET Documentation
StackPolicyURL Property
AmazonAmazon.CloudFormation.ModelUpdateStackRequestStackPolicyURL Did this page help you?   Yes   No    Tell us about it...
Location of a file containing the updated stack policy. The URL must point to a policy (max size: 16KB) located in an S3 bucket in the same region as the stack. If you pass StackPolicyBody and StackPolicyURL, only StackPolicyBody is used. If you want to update a stack policy during a stack update, specify an updated stack policy. For example, you can include an updated stack policy to protect a new resource created in the stack update. If you do not specify a stack policy, the current policy that is associated with the stack is unchanged.

Constraints:

Length
1 - 1350

Declaration Syntax
C#
public string StackPolicyURL { get; set; }

Assembly: AWSSDK (Module: AWSSDK) Version: 1.5.60.0 (1.5.60.0)